三塘湖盆地构造演化与油气聚集  

Structure evolution and petroleum accumulation of Santanghu Basin

作　　者：吴晓智[1,2] 郎风江[3] 李伯华[2] 齐雪峰[3] 刘得光[3] 

机构地区：[1]中国地质大学,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]新疆油田公司勘探开发研究院,新疆克拉玛依834000

出　　处：《地质科学》2011年第3期808-825,共18页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划"973"项目(编号:2009CB219306)资助

摘　　要：三塘湖盆地处于西伯利亚板块南缘，早石炭世晚期，盆地褶皱基底形成；晚石炭世早期，总体处于碰撞期后伸展构造环境；晚石炭世晚期，洋壳消亡，断陷收缩与整体抬升，形成剥蚀不整合。早二叠世，进入陆内前陆盆地演化阶段；中二叠世，盆地进入推覆体前缘前陆盆地发育期；晚二叠世，构造褶皱回返，前陆盆地消失；三叠纪晚期至侏罗纪中期，进入统一坳陷期；中晚侏罗世-早白垩世，盆地坳隆格局基本定型。平面上构造分带清晰：东北逆冲推覆隆起带、中央坳陷带和西南逆冲推覆带；发育基底卷入型和盖层滑脱型两大类构造样式。盆地主体条湖-马朗凹陷发育上石炭统、中二叠统、侏罗系水西沟群3套有效烃源岩，且多表现为两期生烃、两期成藏；形成相对独立3套成藏组合；呈现“晚期近源自生自储成藏”特点；多围绕各自含油气系统形成各具代表性3种成藏模式：1）北东向凹中隆起及古隆起油气聚集成藏；2）北西向冲断带油气聚集成藏；3）不整合油气聚集成藏。三塘湖盆地油气资源量达7×10^8～9×10^8t（油气当量），盆地总体勘探程度较低，主要勘探方向有：围绕马朗一条湖继承性凹陷浅层侏罗系地层-岩性油气藏领域、北缘凸起带石炭系火山岩风化壳与内幕油气藏领域、南缘构造推覆带断层遮挡二叠系白云岩与石炭系火山岩油气藏领域。Santanghu Basin is in the southern rim of the Siberia plate. In the late stage of Early Carboniferous, formed folding base; In the early stage of Late Carboniferous, this basin undergone a extension period after collision activity; In the late stage of Late Carboniferous, Its evolution was composed by the following tectonic activity： ocean crust extinction, fault depression shrinkage and basin uplifting, formed erosion unconformity. In the Early Permian, began foreland basin evolution stage; the middle Permian was a nappe front foreland basin developmental stage. In late Early Permian, this foreland basin disappeared; From Late Triassic to Middle Jurassic,it was a uniform depression; In the Late Jurassic-Early Cretaceous,it was formed the tectonic framework of this basin. Santanghu Basin was divided into three structural belts：east northern thrust nappe uplift,central depression and west southern thrust nappe belt. There are two types structural styles：basement involved and capping slided. In the Tiaohu- Malang sag,it developed three effective hydrocarbon source formations （Upper Carboniferous, Middle Permian and Jurassic Shuixigou Formation ）. These hydrocarbon source have a characteristic of two periods hydrocarbon generating and accumulating; formed three independent hydrocarbon accumulation systems, shown as a character of late period and near source, self generation and self preservation. There are three types of hydrocarbon accumulation：accumulated in the north eastern depression uplift and paleo-uplift,in the north western thrust fault belt,in the unconformity. The petroleum source of Santanghu Basin was up to 7×10^8 -9×10^8t. It has a low exploration degree. There are four exploration potentials： shallow Jurassic litho-stratigraphic reservoir surrounding Malang-Tiaohu depression, Carboniferous volcanic weathering crust reservoir in the northern uplift, Permian dolomite and Carboniferous volcanic reservoir in the southern thrust nappe belt

关 键 词：构造层划分 构造特征 构造演化 油气聚集 成藏模式 三塘湖盆地 

分 类 号：P542[天文地球—构造地质学] TE121[天文地球—地质学]